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    Correlation of molecular biomarker concentrations between synovial fluid and saliva of the patients with temporomandibular disorders
    (Springer Heidelberg, 2020) Yaman, Deniz; Alpaslan, Cansu; Akca, Gülçin; Avcı, Emre
    Objectives The synovial membrane and fluid are involved in the pathogenesis of temporomandibular joint (TMJ) disorders. This study aims to assess the relationship between matrix metalloproteinase-2 (MMP-2), chemerin and prostaglandin (PGE(2)) levels in the synovial fluid (SF) and saliva of patients with TMJ disorder regarding their role in inflammation and the value of being a candidate for predictive biomarkers in the disease. Also, it is aimed to find out whether chemerin's main function triggers the formation inflammatory cytokine markers in the associated area. Materials and methods Thirty-two samples of SF and saliva were obtained from patients with disc displacement without reduction with limited opening (DDWORwLO). Mann-Whitney-U test was used for the comparisons of the biomarker levels in SF and saliva. The correlation between chemerin and BMI (Body Mass Index) is analyzed by non-parametric Spearman's rho correlation coefficient. Results For all of the three biomarkers, statistically significant differences were found between SF and saliva. An unexpectedly high level expression of chemerin was observed in SF. A statistically significant, positive correlation was observed between PGE(2) -MMP-2, and chemerin-PGE(2) in saliva, chemerin and MMP-2 in SF, respectively (p = 0.031, r = 0.382 / p = 0.039, r = 0.366 / p = 0.032, r = 0.379). A positive correlation was determined between saliva and SF levels of PGE(2) (p = 0.016, r = 0.421). Conclusions Chemerin, MMP-2, and PGE(2) can play a role as an inflammatory factor for the development of TMJ disorder.